L-Cysteine Side Effects

L-Cysteine E920 is an essential amino acid protein supplement used in nutraceutical, nutritional supplement, and food additive applications. Though L-Cysteine E920 is considered safe, some are convinced it has potentially dangerous health effects.

What Is L-Cysteine E920?

L-Cysteine E920 is an amino acid that is used in food processing. This product appears as white crystals or crystalline powder with a strong acidic taste. L-Cysteine is used for bread fermentation and is used to prevent ageing in the food industry.

Possible Side Effects of L-Cysteine E920

Although L-Cysteine E920 generally regarded as a very safe and effective supplement, there can be some minor side effects. The side effects may:

  • upset stomach, nausea, vomiting, diarrhea, persistent stomach cramps, body aches, headache, and general gastrointestinal discomfort.

GRAS Affirmation: Yes

Generally recognized as safe (GRAS) is an American Food and Drug Administration (FDA) designation that a chemical or substance added to food is considered safe by experts, and so is exempted from the usual Federal Food, Drug, and Cosmetic Act (FFDCA) food additive tolerance requirements. L-Cysteine is considered safe.

Suggested Dosage


Special Populations Precaution

There is a lot of concern about diet and nutrition for these population, like Newborns, children, pregnant, sensitive to L-Cysteine populations. Better consult to your doctor if you would like to intake L-Cysteine.




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